Key/pair default value - yii

Question

I am trying to create a form which will have multiple fields , some fields will be filled by user and others will be dump into database as defined .
I really do not know how to work with this in term of syntax.
To be more Generic , For Example I have Post tble which have following fileds
id' => 'ID',
'post_head' => 'Heading',
'post_desc' => 'Description',
'post_tags' => 'Tags',
'created_time' => 'Created Time',
'created_date' => 'Created Date',
'post_image' => 'Upload Image',
'post_status' => 'Status',
'user_id' => 'User',
'category_id' => 'Category',
);
Now I want to take input from user in the following fields only :
Heading
Description
Tags
Upload Image
Now I want to know that How can I
pass current time and current date in database field without user
input. user id from session

Answer 1

In your model:
function beforeSave() {
if($this->getIsNewRecord()) {
$this->created_date = new CDbExpression('NOW()');
$this->created_time = new CDbExpression('NOW()');
}
$this->user_id = Yii::app()->user->id;
return parent::beforeSave();
}

Answer 2

1) If the you use database like MySQL you don't need created_date and created_time, just a datetime field (probably created_time is such), which will store both data!
public function behaviors()
{
return array(
'CTimestampBehavior' => array(
'class' => 'zii.behaviors.CTimestampBehavior',
'updateAttribute' => false,
'createAttribute' => 'created_time',
)
);
}
Then for two:
function beforeSave() {
if (!parent::beforeSave) {
return false;
}
$this->user_id = Yii::app()->user->id; // it should be this one, but it depends on how you implemented logging!
return true;
}

Answer 3

Instead of
'created_time' => 'Created Time',
'created_date' => 'Created Date',
You need just one field in your database:
create_time timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP
Many of php functions use timestamp, it's very easy to use it. You can read here.
So if you insert NULL create_time, mysql will insert default value DEFAULT CURRENT_TIMESTAMP - current time.
As said #Veseliq and #mashingan you need to add
function beforeSave() {
$this->user_id = Yii::app()->user->id;
return parent::beforeSave();
}
or try to add in your form view:
echo $form->hiddenField($model, 'user_id', array('value'=>Yii::app()->user->id));
If it doesn't work, show us var_dump(Yii::app()->user->id);